aio: move test read function before event is received

Signed-off-by: deadprogram <ron@hybridgroup.com>

drivers/aio/analog_sensor_driver_test.go

@@ -40,6 +40,12 @@ func TestAnalogSensorDriverStart(t *testing.T) {
 	a := newAioTestAdaptor()
 	d := NewAnalogSensorDriver(a, "1")
 
+	// send data
+	a.TestAdaptorAnalogRead(func() (val int, err error) {
+		val = 100
+		return
+	})
+
 	gobottest.Assert(t, d.Start(), nil)
 
 	// expect data to be received
@@ -48,12 +54,6 @@ func TestAnalogSensorDriverStart(t *testing.T) {
 		sem <- true
 	})
 
-	// send data
-	a.TestAdaptorAnalogRead(func() (val int, err error) {
-		val = 100
-		return
-	})
-
 	select {
 	case <-sem:
 	case <-time.After(10 * time.Second):